DevKit
Small tools that answer one question well. No sign-up, no upload — everything runs in your browser.
Paste any cron expression to see what it means in plain English and exactly when it will run next — in your own time zone, DST included.
Test a regular expression against your own text, see every match and capture group highlighted, get each piece of the pattern explained, and check what JavaScript, PCRE and RE2 actually support. Everything runs in your browser.
Work out the network address, broadcast address, host range and mask of any IPv4 or IPv6 CIDR — and check whether an IP belongs to it. Nothing leaves your browser.
Convert between Unix timestamps and readable dates in any time zone. Seconds or milliseconds are detected for you — and nothing you type leaves your browser.
Convert a date and time across time zones, with correct daylight-saving handling — including wall-clock times that do not exist on that date.
Current weather and a 7-day forecast for any city. No account, no API key — data straight from Open-Meteo.